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Letters .Patent No. 78,922, dated June 16, 1868.

IMPROVEMENT CLAMP 0F HUB-BORING MACHINE.

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To ALL WHoM IrV MAY ooNoEnN:

Beit known that I, GUSTAVUS V. BREUHT, of St. Louis, in the county of St. Louis, and State of Missouri, have invented a new and useful Improvement in the Clamp of- Hub-Boriug Machines; and I do hereby declare that the following is n. full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specification.

This invention relates to e. machine for boring out the' centres of wagon-hubs, for `tttingwthe bnoxes thereto; and it consists inthe manner in which the clamps or jaws are formed by which the hub is held while the operation is being performed.

Figure 1 represents the clamps, attached together by screws, as when 4surrounding a. hub. x

Figure 2 is an edge view, showing a, sectional side view of a wagon-hub, (in'red,) with theclamp' attached, the section being through the line a: a: of iig. 1 p Y Figure 3 is @detailed view of one of the clamps or jaws, showing the manner in which they are constructed. l 4

Similar letters of reference indicate correspon/ding parts.

A represents the clamps or jaws` B represents the screws'by which the clamps are connected together. i

As these clamps have been made heretofore, the screw-thread for the screws B to work in has been cut in .the elempitselt, which, being of cestiron, soon -wears out, consequently requiring new clamps when such castiron threads become useless. A

My improvement consists in forming thcclamps with slots or mortises through them, for the'rcception of wrought-iron or steel nuts for the screws to work in, thereby enabling me to renew the threads'as often as may be necessary, without. destroying the clamps.

The screws B have each a right and left-hand screw-thread on them, as seen in the drawing, so that, by turning them, the clamps are brought together around the hub.

Gear-wheels are applied to these screws, so that they turn simultaneously, and the clamps are supported and heldin a. freine. v

The jaws marked a, fig: 3, enclose the inner edge of such frame.

This frame also supports the boring-mandrel.

As my invention consists in an improvement on--the clamps ofthe machine, I have ,notl deem-ed it necessary to show the whole machine, as the operation will be readily understood from the drawing end from'the description;

Having thus described my invention, I claim as new, and desire to secure by Letters Patent- As a new articleof manufacture, a. clamp, A, for a. hub-boring machine, cest or formed with'slots, for the reception of nuts, and provided with projections Q and serrntededges, as and for` the purpose set forth,

GUSTAVUS V. BRECH'I.`

' Witnesses:

GEORGE THonNnn, ADAM BoEeK. 

